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</div><div class="twikiRevInfo"><span class="twikiGrayText"><span class="twikiToolbarElem">Cinelerra.VideoInverseTelecine</span><span class="twikiToolbarElem">r1.3 - 16 Jan 2004 - 22:19 - <a class="twikiLink" href="../Main/AlexFerrer">AlexFerrer</a></span><span class="twikiToolbarElem"><a href="#TopicEnd">topic&nbsp;end</a></span></span></div></div>
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<h3><a name="VideoInverseTelecine"> </a> <a class="twikiLink" href="VideoInverseTelecine">VideoInverseTelecine</a> </h3>
This is the most effective <span class="twikiNewLink" style="background : #FFFFCE;"><font color="#0000FF">deinterlacing</font><a href="http://www.ftconsult.com/twiki/bin/edit/Cinelerra/Deinterlacing?topicparent=Cinelerra.VideoInverseTelecine"><sup>?</sup></a></span> tool when the footage is a video transfer of a film. Here the film was converted from 24fps to 60fps. Then the 60fps was downsampled to 30fps by extracting odd and even lines and interlacing the lines. The IVTC effect is primarily a way to convert interlaced video to <span class="twikiNewLink" style="background : #FFFFCE;"><font color="#0000FF">progressive video</font><a href="http://www.ftconsult.com/twiki/bin/edit/Cinelerra/ProgressiveVideo?topicparent=Cinelerra.VideoInverseTelecine"><sup>?</sup></a></span>. It undoes three patterns of interlacing.
<pre>
       A AB BC CD D
       AB CD CD DE EF
       Automatic
     
</pre>
The first two options are fixed patterns and affected by the pattern offset and odd field first parameters. The last option creates several combinations of lines for each frame and picks the most progressive combination. It's a brute force algorithm.
<p />
This technique doesn't rely on a pattern like other techniques and is less destructive but the timing is going to be jittery because of the lack of a frame rate reduction. 
<p />
-- <a class="twikiLink" href="../Main/AlexFerrer">AlexFerrer</a> - 19 Dec 2003 <strong><em>From <a class="twikiLink" href="SecretsOfCinelerra">SecretsOfCinelerra</a></em></strong>
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